Alarm door-fastening



(ModeL) M. M. ROBERTS.

ALARM DOOR FASTENING. 7 No. 313,371. Patented Mar. 3, 1885.-

ATTORNEYS WWITNESSES Y %INVE TOR W; m M, 1 mm "7m a'rnfnr @FFMIEQ MARION M. ROBERTS, OF NORRIS CITY, ILLINOIS.

ALARM DOOR-FASTENlNG.

SPECIFICATION forming part of Letters Patent No, 313,371, dated March 3, 1885.

Application filed July 30, 1884.

T 0 aZZ whom, it may concern:

Be it known that I, IVIABION M. ROBERTS, a citizen of the United States, residing at Norris City, in the county of White and State of Illinois, have invented certain new and useful Improvements in Alarm Door-Fastenings; and I do declare the following to be a tion. Fig. 2 is a side view of the device folded. Fig. 3 is atop view opened for use.

This invention has relation to alarm doorfastenings; and it consists in the construction and novel arrangement ofdevices, as hereinafl ter set forth, and pointed out in the appended claims.

In the accompanying drawings, the letter A designates a metallic shank or bar, which is usually made in two sections, B and O, which are hinged together at d. \Vhen so hinged, one of these sections is provided with a lug or lugs, e, and the other with a loop or catch, F, adapted to engage said lug or lugs when the sections are unfolded and arranged in line with each other. In this manner the sections are braced together rigidly. so that the shank will operate as a solid bar. The hinge construction enables the article to be folded in convenient compass to be carried, and facilitates setting the trigger-lever after an explosion. The shank is provided at one end with the point G, which is serrated so that it will securely engage the flooring when the fastener is set up in oblique position, its upper end resting against the lower part of the door. The point G is usually pivoted and provided with a chamber, h, for a blank cartridge. By means of a key, It, the point G is secured in position after loading, so that it will be held rigidly in line with the shank. To this end of the shank is pivoted the hammer L, which is operated by the spring m.

(Model The tail n of the hammer extends to the mid die or hinged portion of the shank, to engage the tail 1) of the trigger-lever P. This trigger-lever consists of a point, 8, having a serrated end and Epivoted to the section C, an extended portion, t, and a tail, 1). The point 8 is allowed to have-a certain amount of vibratory play, but is held in line with the shank by the engagement of its tail with that of the hammer when the article is set for use. It is preferred to make the shank-sections B and O of parallel plates, as indicated at a, said plates being braced in position and held together by the hinge-connections and the pivots of the point portions.

\Vhen set in the bracing position hereinbefore referred to, the lower end of the fastener resting upon the floor and its upper end in engagement with the door. the latter being closed, it will be seen that any attempt to open the door will affect the point 8 of the trigger-lever to move the latter, so that it will raise the hammer. At the proper height of the latter its tail will escape from its engagement with the trigger-lever, and the spring will act, causing the hammer to fall and explode the cartridge.

I-Iaving described this invention, what I claim, and desire to secure by Letters Patent,

1. An alarm door fastener having at one end a point and cartridge-chamber and a spring-hammer, and at the other atrigger-lever having a point extending outwardly and a tail extending inwardly and engaging the tail of the hammer. substantially as specified.

2. A sectional alarm-brace hinged at its middle portion and provided with end points, a cartridge-chamber, a hammer and spring, a loop or center catch, and a trigger-lever terminating at one end in a point, and at the other in a tail to engage that of the hammer, substantially as specified.

In testimony whereof Iaffix inysignature in presence of two witnesses.

- MARION M. ROBERTS.

Witnesses:

SILAS V. MITCHELL, THERON W. Hones. 

